Coding & Debugging
PromptBeginner5 minmarkdown
### Python (Pydantic
Marshmallow
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Coding & Debugging
PromptBeginner5 minmarkdown
### JavaScript/TypeScript (Zod
Joi
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Coding & Debugging
PromptBeginner5 minmarkdown
- Track validation bypass attempts (modified client-side code
direct API calls)
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Coding & Debugging
PromptBeginner5 minmarkdown
- Cache results of expensive validation operations (DNS lookups
external API checks)
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Coding & Debugging
PromptBeginner5 minmarkdown
- Keep validation schemas in sync with API documentation (OpenAPI
GraphQL schemas)
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General
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- Use established validation libraries (Zod
Joi
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General
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- Never trust any input regardless of source
including internal services
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General
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- [ ] Validation is implemented at all layers (client
server
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General
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- [ ] File uploads validated for type (magic bytes)
size limits
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General
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After completing the validation implementation
verify:
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General
PromptBeginner5 minmarkdown
- Unit tests cover every validation rule with valid
invalid
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General
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- No system internals
stack traces
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General
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- Enum values validated against an explicit allowlist
not a blocklist
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General
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- Implement temporal validation (expired tokens
past dates
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General
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- Implement file upload validation with magic byte verification
not just MIME type or extension
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General
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- Check for malicious patterns: excessively nested JSON
zip bombs
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General
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- Sanitize file names to remove path traversal sequences (../
%2e%2e/) and special characters
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General
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- Validate complex structures (JSON
XML
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General
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- Verify edge cases: empty strings
nulls
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General
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- Validate and sanitize file uploads for type (magic bytes
not just extension)
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Coding & Debugging
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- Encode output based on context (HTML encoding
URL encoding
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General
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- **Schema validation**: JSON Schema
Zod
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General
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- Normalize whitespace
trim leading/trailing spaces
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General
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- Map validation rules to the appropriate layer (client
server
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